Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEC

Junction box plan mark

A junction box mark shows where cables are joined in an enclosure, commonly in ceiling voids for lighting circuits or above ceilings for equipment connections. Plans draw a small circle or square with a dot, sometimes labelled JB, at the location.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Junction box, installation plan. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A conductor junction dot on a schematic shows electrical connection; this plan mark shows a physical box.

Full reference

JUNCTION

Symbols

Conductor connection junction

A junction indication marks a documented electrical connection between conductor branches. The junction is a drawing connectivity statement: the branches belong to one connected electrical network at that point. It is different from a hardware splice which may have its own material and installation record.

Drawing use: Schematic
Application: Connections & wiring
Reference family: Manufacturer

A distinction that matters

A crossing line is not necessarily a connected conductor.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.